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HAP, available in Japan since 1970.

wow, just found this where they compared HAP to fluoride and found no difference: https://www.nature.com/articles/s41405-019-0026-8

I have novamin. I think it makes my teeth feel different. May be placebo.

A lot of people swear by HAP, novamin, etc. I suspect it all comes down to increased oral care and diligence though!



> I think it makes my teeth feel different.

I definitely feel something too, like the surface is slicker.




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